editing/pasteboard/5075944-2.html and 5075944-3.html should be renamed and converted to dump-as-markup tests
https://bugs.webkit.org/show_bug.cgi?id=60923

Renamed pasteboard/5075944-2.html to pasteboard/preserve-underline-color.html and pasteboard/5075944-3.html to
deleting/deleting-line-break-preserves-underline-color.html. Also converted them to dump-as-markup tests.